Elevator-brake.



N. W. GUDMUNDSON.

I ELEVATOR BRAKE. APPLICATION FIL ED MAR. 23.1915.

1,205,989. Patented Nov. 28, 1916.

l- J 0 1% WITNESSES.- 1 ENTOR.

19% 7% BY y77z afl jar-4" m f ATTORNEYS.

at Salt Lake City, in the county of NIELS W. GUDMUNDSCN, OF SALT LAKE CITY, UTAH.

ELEVATOR-BRAKE.

Specification of Letters Patent.

Pateuted'Nov. 28, 1916.

Application filed March 23,1915. Serial No. 16,438.

To all whom it may concern Be it known that I, NIELs W. GUDMUND- son, a citizen of the United States, res'icinlg a t Lake and State of Utain'have invented. certain new and useful Improvements in Elevator-Brakes, of which the following is a specification.

Hy invention relates to elevator brakes, and has for its object to provide an electrically operated brake whereby an elevator may be stopped or retarded in its vertical movements by levers moved with electric energy and by the specially efiective means herein shown. These and other objects which will be apparent I accomplish with the device illustrated in the accompanying drawings in which similar letters and nu-- merals of reference indicate like parts throughout the several figures and as described in the specification forming a part of this application and pointed out in the.

appended claim.

In the drawings in which I have shown a substantial embodiment of my invention, Figure 1 is a longitudinal section of the device. Fig. 2 is an elevation of the device in place on an elevator which is partially cut away. Fig. 3 is a plan View of the same, parts of the floor of the elevator cut away. Fig. 4 is a plan view of one pair of gripping tongs. Fig. 5 is a vertical section of the switch plug, parts of the floor cut out.

In the operation of elevators on which passengers and freight may be vertically moved up or down in a building, it is desirable to provide a brake on the elevator, whereby the vertical movement may be controlled, and should the mechanism by which the elevator is operated fail to work or some portion thereof give way; that the elevator will not fall to the bottom of the shaft within which it is operated. I have provided such a device and to the underside of the floor of the elevator I secure a longitudinally disposed solenoid A. Media-11y within the core of said solenoid a bufler 2 is secured. Within the ends of the core 3 of said solenoid is loosely operated a pair of bars 4. made of magnetic material that may be drawn against said buffer 2. On each of said bars 4 is carried a spiral spring 5, with one end thereof bearing against the end of the solenoid and the other end secured in place b a cross bar 6. Below the floor D, of the e evator, and in spaced rela= oted.

floor B and adjacent" the guide rails C of the elevator, are fastened the bracket buffers 7 against which the adjacent ends of said bars 4 are held by said springs 5 when :no

electric current is passing through the solenoid. Two brackets o are secured to the floor B, in each of which a lever 9 is piv- The upper ends of said levers are pivoted to the outer and adjacent ends of said bars a. Two pairs of gripping members or tongs 10 are securely pivoted to the floor B and adjacent the said guide rails C, and so placed in relation to the said levers 9, that when the upper ends of said levers are moved toward each other by the action of the solenoid that said tongs will'be moved on their pivots and will grip the said guide rails C and stop or retard the vertical movement of the elevator. In the said floor D of the elevator, a switch plug 11 is mounted, and it is connected with said solenoid A by the wires 13 and is in the electric circuit with a storage battery or other source of electric energy. Another wire l-it connects said solenoid with said battery and completes the circuit. The electric battery or other source of electric energy is preferably located in the basement of the building within which the elevator is operated, and is not shown in the drawings.

The operation of the device is as follows :VVith the storage battery charged [and the switch plug pushed down the elevator may be operated and raised or lowered free of the brake. When the operator wishes to apply the brake to the elevator the said switch is allowed to raise and assume the position shown in Figs. 1 and 2. This completes the electric circuit and the passing of the currentthrough the solenoid draws the said bars 4i longitudinally toward each other. This movement of the said bars will move the upper ends of the levers 9 toward each other and cause the lower ends to press the contiguous ends of the tongs 10 apart and the other ends of said tongs will grip the guide rails C with the force required to stop or retard the elevator as desired. As will be readily seen should the elevator start to fall on account of some of its operating parts breaking or failing to work properly, the fall would be stopped by the operator allowing the said 'from said switch plug.

switch plug to raise by removing his foot The said switch plug is normally held in its raised position by the spiral spring 12. The said buffers 2 and 7 prevent the said bars 4 from moving too far in either direction.

' Having thus described my invention I desire to secure by Letters Patent and claim An elevator brake consisting of a solenoid secured beneath the floor of an elevator; a pair of alined bars operable therein; bufi'ers to limit the movement of said bars in either direction; levers fulcrumed to the floor of said elevator and with one end of each piv- 15 I vator to complete the circuit between a 26 source of electric energy and said solenoid. In testimony whereof I have aiiixed my signature in presence of two witnesses.

NIELS W. GUDMUNDSON.

Witnesses:

1V. HENRY Lnn, SAM RANEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

